Dust-cap.



H. P. KRAFT.

DUST CAP.

APPLICATION FILED DEC. l1. I914.

1,201,198. Patented 0ct.10,1916.

' I INVENTOR WlT es'srsg: M By Attorneys, 7

UNITED STATES PATENT OFFICE.

HENRY PHILLIP KRAFT, 0F RIDGE-WOOD, NEW JERSEY.

DUST-CAP.

Applicationfiled December 17, 1914. Serial No. 877,790.

To all whom it may concern Be it known that I, HENRY PHILLIP KRAFT, a citizen of the United States of America, residing at Ridgewood, in the county of Bergen and State of New-Jersey, haveinvented certain new and useful Improvem'entsin Dust-Caps, of which the following is a specification. r

.This invention relates to dust caps for tire valves, and aims to provide certain improvements therein. 5

In the common form of tire valve the casing ofthe valve extends inwardly through the rim, and it is customary to provide an elongated cap to inclose the projecting end of the valve to exclude dust and moisture, and to protect the valve.

According to the present invention, I pro? vide a dust cap which is easily applied and removed, and which will adequately hold lts position upon the valve in use.

Referring to the drawings which lllustrate one form of the invention, Figure l is a sectional view of a rim showing a t re valve in elevation and the dustca'p in dlametrical section. Fig. 2 is a perspective view of the parts of the dust cap detached. Fig. 3 is a cross section on the line 3-3 1n Fig. 1. Fig. 4 is an enlarged detailed sectional view showing a portion of the cap in the act of applying same to the valve.

Referring to the drawings, let A indicate the casing of a common form of tire valve which is usually screw-threaded throughout its length to receive a clamping nut B which is screwed upon the valve until it reaches the felly C of the wheel rim, thus holding the valve rigidly in place.

D indicates the cap as a whole, which is formed of a more or less cylindrical shell E designed to fit over and inclose the projecting end of the tirevalve, and a foot F I which is adapted to make contact with the valve and hold the structure in place.

According to the present invention, the foot-of the cap is provided with a .washer G which is preferably formed of rubber or other flexible material. The washer G is so mounted in the cap as to leave its interior portion H free to flex as it passes along the screw-threads of the valve casing. The aperture J in the washer 'isof smaller diameter than the diameter of the .valve casing, so that the washer mustsubmit to a certain degree of flexure in applying it to the cas- Specification of Letters Patent.

Patented Oct. 10, 1916.

ing. This is best shown in Fig. 4;, which lllustrates the position of the washer when the cap is being pressed toward the rim nut B 1n the act of applying the cap. When the cap has'been pressed down as far aspossible,- it is given a few turns, with the effect that the .flexed portion H moves toward the rim nut and holds the cap securely in place with its foot against the nut.

An important feature of the invention is the method of securing the washer to the foot of the cap. This may be accomplished 1n var ous ways, but it is very desirable that a large part of the margin of the washer shall be engaged by the cap. In the construction shown, the foot of the cap is formed with a collar K which is formed with a deep annular recess L designed to receive the marginal portions of the washer. Preferably the interior of the collar is screw-threaded to receive the exterior of the shell E, and theconstruction is preferably such that the bottom of the shell will press against the surface of the washer when the sleeve is screwed on the shell. By this construction the washer is securely held inplace and will not strip from the cap during the operation of applying it to or removing v p it from the valve.

' While I have \shown and described one form of the invention, it is understood that I do not wish to be limited thereto, as various changes may be made therein without departing from the spirit of the invention.

What I claim is: 1. A dust cap for tire valves or the like, comprising an elongated shell adapted to fit over the valve casing, said shell having a foot'portion, and a washer of flexible material held in said foot portion, and adapted to hold the cap in place by engagement with said casing. 1

2. A dust cap for tire valves or the like, comprising an elongated shell adapted to fit over the valve casing, said shell having a foot portion, and a washer of flexible material held in said foot portion, said washer having its inner marginal surface unsupported and being adapted to flex asit -passes along the valve casing, and said washer being adapted to hold the cap in place by engagement-with said casing.

3. A dust capfor tirevalves or'the like, comprising an elongated shell adapted to fit over the valve casing, said shell having a foot portion, said foot portion having a recess, and a washer 0f flexible material having its outer marginal edges in said recess.

4. A dust cap for tire valves or the like, comprising an elongated shell adapted to fit over the valve casing, and said shell having a foot portion, said foot portion comprising a sleeve adapted to screw on said shell, said sleeve having an interior recess, and a washer of flexible material having its outer marginal portions in said recess.

5. A dust cap for tire valves or the like, comprising an elongated shell adapted to fit over the valve casing, and said shell havand a washer of flexible material. having its outer marginal portions in said recess, and said shell being adapted to compress said washer in said recess.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

HENRY PHILLIP KRAFT.

Witnesses:

E. V. MYERS, FRED WHITE. 

